Tool holder for machine tools



Feb. 14, 1928.

1,659,386 J. J. N. VAN HAMERSVELD TOOL HOLDER FOR MACHINE TOOLS Filed 00%.12, 3.925 2 Sheets-Sheet 1 IIE Feb. 14, 1928.

J. J. N. VAN HAMERSVELD TOOL HOLDER FOR MACHINE TOOLS 2 Sheets-Sheet 2 O Filed Oct. 12, 1925 WIVW atwmq S Patented Feb. l4,

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a in JQHH J. N. VAN I-IAINIEBSVELD, OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR TO THE TNARNER AND S'WASEY CUMPANY, OF CLEVELAND, UHIO, A CORPORATION 013 TQOL HGLDER FOR DULCE-ZINE TOOLS.

Application filed ()ctober 12, 1925.

this invention relates to tool-holders for machine tools, and has for its chief object to provide a holder which accommodates a plurality of tools such as roughing and fintools adapted to be brought into cutting relation with the work successively.

Further the invention aims to do away with the necessity of having separate supports for the roughing and finishing tools and to provide a unitary holder for both types of tools, the whole being so arranged that the roughing tool or tools can be caused to cut when the slide carrying the holder is moving in one direction with respect to the work and the finishing tool can be brought into cutting relation with the work and caused make the finishing cut when the slide is moving in the opposite direction.

it is generally the case that when a ma chine, such as a turret lathe is equipped with roughing and finishing tools, the tools are supported on separate faces of the turret and are brought into cutting; relation with the work by indexing the turret, the turret slide making a forward working; stroke and an idle return stroke for each tool.

By the present invention the roughing and finishing tools are so arranged that when the invention is applied to a turret lathe there need be no indexing of the turretto bring the roughing and finishing tools into cutting relation with the work, and the return stroke of the slide is made a working stroke, the same as the forward stroke, thus effecting a considerable saving in time.

. luief'lv suunnariaed The inve consisting in certain novel details of construction, and combinations and arrangements of parts which will be described in the specification and set forth in the appended claims.

Although my invention is not confined to any particular kind of machine tool, nor to a machine tool for operating on any particukind of work, in Sheet 1 of the drawings have illustrated my invention applied to a turret lathe providedwith an attachment for boring; or turning oval surfaces which may be straight or tapered axially considcred, wiich attachment involves an oscillatory tool-carrying member. This attach- Serial No. 61,892.

nient fully described and claimed in a separate application, Serial No. 61,663, and the invention is illustrated in connection therewith, for the reason that it is particularly useful with an attachment of this kind, in view of the expense involved in providing separate oscillatory supports for the rough inn and finishing tools. I

Fig. 1 is a side view of a portion of the turret lathe equipped with my invention, certain parts being in section; Fig. 2 is a sectional view substantially along the line f2-2 of Fig. IljFig. 8 is a detached view of the tool-holder, shown partly in section and partly in elevation and showing a portion of the workpiece; Fig. 4 is an end view of the same, this view showing the finishing tool in position. for cutting; Fig. 5 is a similar view showing the roughing tool in position for cutting; and Figs. 6, 7 and 8 are sectional views substantially along the lines 66, 'l'? and 8 8 respectively, of F ig. 3, omittingthe workpiece.

Referring); now to the drawings, 10 is a portion of the bed of the lathe, 11 a portion of the head, and 12 a portion of the turret slide having; the usual turret 13. Mounted on one face of the turret is a tool-holding bracket 14 which supports an oscillatory member 15, provided with an arm 15 which carries the present tool-holder, and a second arm 15, carrying a roller 16. i

As the turret slide moves forwardly, the roller 16 is adapted to come into engagement with a suitably shaped rotatable cam 17 carried on a shaft- 18, supported and journaled in a bracket 19 mounted on the head 11, this shaft being); adapted to be rotated at the speed of rotation of the work or workpiece hy being: connected by suitable gearing 520 with portion of the chuck holding the workpiece, the latter being indicated at 521. The roller 16 is held in engagement with the rotating cam 17 by a spring 22 surrounding a plunger movable endwise in a barrellike extension 14 of the bracket 14, and acting); on a lug 15 carried by the oscillatory support 15.

By an attachment ofthis kind, which is fully described in my companion applica tion referred to. an irregular surface can be bored or turned on the workpiece, the tool carried by the oscillatory support being moved in and out with reference to the axis of rotation of the workpiece by the rotatable cam, so that a surface of the proper contour or outline will be out.

Inasmuch as the attachment and its function is fully described in my companion application, further description thereof is an necessary, and reference will now be had to the tool-holder itself.

The tool-holder as illustrated, includes a bar 524- which may be secured in any suit able way to the part which is designed to support it, the nature of this part depending, of course, upon the type of machine to which the invention is applied, but inasmuch as I have shown my invention applied to a machine having an oscillatory tool-holding support 15, the bar is secured to the rncinber 15. It can besccured thereto in diii crent ways, but in this instance the bar has an enlarged. rear portion which is fitted into aboss 15 in the arm 15" of member 15, and is securely held therein by a set-screw 25 (see Fig. The roughing tool. which is indicated at ea, held at. the forward end of this bar, and in this instance on a removable portion 24"- thereot, the bar being made in sections, or provided with a removable portion 2-1: for convenience of assembling, as will be eiq ilained presently. The roughing tool 26, as illustrated in Fig. 7, is secured to the removable portion 24-? ot the bar by set-screws 27.

Rotatahly supported on the bar 24 and its extension Qel is a sleeve 28, which has a forward removable portion 28 carrying the finishing tool 29 which is secured in the forward end of the extension 28 of sleev 28 by set-screws 80, as shown in Fig. 6.

The sleeve :28 is held from endwise movement on bar 2% in either direction. lit is held from movement toward the enlarged portion of the bar by reason of the fact that the extension 28 of the sleeve has a closed forward end which bears against the forward end of the extension 24: of bar 24:. The sleeve 28 is held from endwise 1novcment in the opposite direction by reason of the fact that the extension 2st of the bar is provided with a shoulder Qel", which is engaged by the end of the body portion of sleeve 28, i. e. the threaded end onto which the extension 28 is screwed.

In assembling these parts, the body portion of the sleeve 28 is applied onto the bar; then the extension or nose Ql" of the bar is screwed into place; and then the extension 28 of the sleeve applied and is screwed onto the body portion of the sleeve until the end of the sleeve extension 28 engages the end of the bar extension or, and until the threaded end 01 the body portion of the sleeve 28 comes up against the shoulder 24d. By this arrangement the sleeve the nose ot the ronohin r tool projects through a slot i? formed in too cxtoinion oi the sleeve, and when the tools are in the relative position shown in Fig. 5, the end 5155" of the slot bears against the under side of the roughing toolQt.

filter the roughir out has been completed during the :torward movement of the slide, to bring the finishing tool into cutting rehn tion with the r'oll jintft. it is only net-cs5 ry to turn the sleeve 25% with its extension id and the cutting tool All on the bar it}: in the direction i Tlicated by the arrow in Fig. 53, until the opposite end 525:3 of the slot 528 rests upon or engages the top of the roughing tool as, th ion being illusiraled in lhig. T. This brings the Finishing tool into the po: ,'tion shown in l igs. 213. .l: and 6. it then occupying a position of alignment with the roughing tool with its nose projecting out ardly slightly beyond the nose oi the roughing tool, as indicated in Fig. l. To thus rotate the sleeve and bring the finishing tool to the position stated, the sleeve rotated indicated by the arrow in Fig. 5. Inasmuch as the workpiece is ro ated in the same direction, it obvious that the pressure or thrust due to cutting, transmitted from the workpiece to the tool is in a direction such as to hold the end 28 of slot 28 down onto the roughing tool, with the result that the finishing tool is firmly supported, and a smooth finishing out can be taken without employing any other means for holding or supporting the finishing tool.

The sleeve with the cutting tool may be turned in various ways, but in this instance the rear end of the sleeve provided with an outwardly projecting handle 31 which, as illustrated, is next to the enlarged portion of the bar El, which is received in the boss 15. Additionally I prefer to provide a suitable detcnt arrangement to hold the sleeve against accidental movement due to vibration. This consists in this instance, of a ball which functions as an ordinary plunger pressed inwardly by a spring 32, so as to engage in either ot two n'operly positioned depress. formed in the bar 24. This detent in practice holds the sleeve 28 in position when a roughing cut is being taken, or when the tools are idle, but as before stated, when the linisln ing cut is taken, the sleeve held in it; proper position with the sleeve hearing Hill "i" all til a 'ainst the roughing tool at the end on the finishing tool.

l l hen the finishing tool is in its inopera tive pOSltlOll as illustrated in Fig. 5, the nose oi the tool will always be out of cutting relation with the workpiece, regardless of whether an external surface is being turned, or whether an internal surface is being;- bored, and this true, whether the internal snrtace is r or ovzl shaped, tor as indicated ii. the axis of the toolholding bar the axis of the workpi ce, indicated C so that the tool-holding bar has in etlect an eccentric position with respect to the hole being bored. I

In operation, to cause the roughing cut to be taken, the operator first having rotated the sleeve 28 Iii/l1 the finishing; tool 29 in the direction indicated by the arrow in Fi 4? and 8 until it reaches the position shown in Fig; 5, throws in the teed, which moves the turret slide forwardly; the finishing tool, its supporting sleeve and the handle 31 then being in the position indicated in Fig. 5. l l hen the roughing cut is completed, the forward movement of the slide is stopped, usually automatically. Then the OPQIGCOT turns the sleeve by swinging the handle from the position shown in to the positions shown in 3, l and 8, moving the same in the direction indicated by the arrow in Fig. 5. Then the feeding motion of the side is reversed, and on the reverse stroke thereof the finishing cut taken. Thus there is no idle movement at the turret slide as cutting operations are performed during both the tor ard and reverse strokes. Additionally there is no necessity of indexing the turret and separate toolholdinp; brackets for the rough and finishing tools are unnecessary. lhis etlects a saving of parts and also time in the set-up of the machine, but what is more in'iportant, the machine can be operated at. very high efiiciency, since idle strokes of the slide are eliminated, and

both strokes em iloved for cuttin b lit is, of course, obvious that I may, if desired, employ two or more roughing tools arranged side by side, all functioning in a similar manner, instead ot a single rougl'iif too]. Fu erniore, the tools which are mounted in my improved holder need not of .i'iecessity be roughing; and finishing tools, but one may be a turning or boring tool carried by the bar, and the other carried by the sleeve may be a bacloiiacing or backchain Quinn tooi, or possibly other combinations of tools may be employed in my holder, and finally I wish to repeat that my improved tool-holder may be employed advantageously in other types of machines than a turret lathe, and when eniiployed in a turret lathe it need not be associated with an oscillatory holder or an attachment such illustrated for turning or boring a surface which is not round in cross-section.

I therefore aim in my claims to cove all modifications which do notinvolve a'de parture from the spirit and scope of my invention as defined in theappended claims.

Having described my invention, I claim:

1.. In combination, two coaxial tool-supporting members, one surrounding the other and each having; a tool supported thereon independently of the other member, and means for moving one of said members so as to bring the tool carried by it to and from cutting position.

2. In combination, a tool-supporting member havinga tool a second tool sul'iporting member in the form of a sleeve 011 said first named member and also having a tool, said sleeve being movably mounted so that the tool carried by it may be brought to and from cutting position, each oi said members supporting its tool independently of the other member.

3. In combination, a fixed tool-supporting member having a tool a second tool supporting member in the form of, a sleeve surrounding said first named member and also having a tool, and means for rotating said sleeve so as to move itstool to and from cutting position, each of said members supporting its tool independently of the other member.

4. In combination, a fixed tool-supporting member, a second tool supporting member in the form of a sleeve mounted thereon, a tool carried by said first member and projecting through the sleeve, and a tool carried by the sleeve, each of said members supporting its tool independently of the other member.

5. Incombination, a fixed tool-supporting member having a tool, and a second tool supporting member in the form of a sleeve rotatably mounted on said first named member and carrying a tool, said sleeve being provided with a slot through which the firstmentioned tool projects, each of said members supporting its tool independently of the other member.

6. In combination, a fixed tool-supporting member provided with a cutting tool," a sleeve rotatably mounted on said member and provided with a cutting tool, said sleeve adapted to be moved so as to bring the tool to and from cutting position, and means whereby the thrust created by the cutting operation is transmitted from the sleeve to rotating said sleeve so as to move the tool carried by it to and from cutting position.

8. In combination, a fixed tool-supporting member having a tool, a sleeve rotatably mounted on said member and having a tool, means whereby the sleeve may be rotated in one direction to bring one tool to cutting position and in the opposite direction to position the other tool for cuttin and means for retaining the sleeve in either of its two positions. a

9. In combination. a fixed tool-supporting member having a tool, a sleeve rotatably mounted with respect to the axis of said member and having a tool, means whereby the fixed tool-supporting member resists the tendency of the sleeve to rotate when its tool is cutting, and separate means tor preventing rotation oi the sleeve when either tool is in cutting position.

10. A tool-supporting assembly for metal working machines comprising a fixed toolsupporting member having a cntt-ingtool, and a sleeve rotatable thereon and having a cutting-tool, the liX-C-(l tool-supporting menr her and the sleeve having engaging shoulders whereby endwise movement of the sleeve in either direction is prevented.

11. A tool-supporting assembly for use on metal working machines comprising a fixed tool-supporting member having acuttingtool, and a sleeve rotatable thereon and provided with a cutting-tool, both the lined toolsupporting member and the sleeve being formed in section so as to provide shoulders for preventing endwise movement of the sleeve.

12. A tool-supporting assembly tor use on metal working machines comprising a tir d tool-supporting member having a tool. said member comprising a main portion and a removable end portion having threaded err gagement, and a sleeve rotatable on both portions of the fixed tool-supporting member and comprising; two portions having threaded engagement.

13. A tool-supporting asrembly for use on metal working machines comprising a lined tool-supporting member having; a tool, said member comprising a main portion and a removable end portion having threaded cnz,'21gei1"iei1t and a sleeve rotatable on both portions of the fixed tool-supporting member and comprising two portions having threaded engagement, the end portion of the lined tool-supporting member having shoulders adapted to be engaged by co-o ieratinn shoulders of both portions of the sleeve to prevent endwise movement of the latter.

In testimony whereof, I hereunto allix my signature.

JOHN J. N. VAN I-IAlil'Eltti H llel).

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